So for roughly a month now in both multiplayer and zombies textures for scenery and guns will not load correctly- its all blurry and pixelated. Ive cleaned my disk several times and its not scratched or damaged, so I assume its not that. Is there something I should delete or redownload?

Nice. If it happens again, there's a good chance that you need to get a new disc. Or you can just borrow a different game disc from a friend and install it on your Xbox and just used you disc to play the game, the textures data/part of the game disc might be broken or glitched out..